Which three statements are true concerning logical and physical database structures? (Choose three.)

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Which three statements are true concerning logical and physical database structures? (Choose three.)

A. All tablespaces may have one or more data files
B. The extents of a segment must always reside in the same datafile
C. A smallfile tablespace might be bigger than a bigfile tablespace
D. A segment can span multiple data files in some tablespaces E. A segmentג€™s blocks can be of different sizes F. A segment might have only one extent G. Segments can span multiple tablespaces